XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.24.3

Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 20,497,173 | $ 21,213,165 | $ 20,805,777 | $ 21,615,968
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 20,497,173 | $ 20,649,663 | $ 20,805,777 | $ 21,032,541
Weighted Average Interest Rate | 10.79% | 10.96% | 10.90% | 10.80%
FFELP Loans(1) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 0 | $ 563,502 | $ 0 | $ 583,427
Weighted Average Interest Rate | 0.00% | 7.35% | 0.00% | 7.10%

X
- Definition Financing Receivable, Before Allowance For Credit Loss, Average Balance + References No definition available. + Details
Name: | slm_FinancingReceivableBeforeAllowanceForCreditLossAverageBalance
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Weighted Average Interest Rate On Loans + References No definition available. + Details
Name: | slm_WeightedAverageInterestRateOnLoans
Namespace Prefix: | slm_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=slm_PrivateEducationLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FederalFamilyEducationLoanProgramFfelpGuaranteedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |